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can't find crash report at location given on my computer. mc crashes every time i try to play selected world
Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Updating screen events

A full error report has been saved to C:\Users\Barnes Electric\AppData\Roaming\.minecraft\crash-reports\crash-2012-12-23_20.28.13-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash



--- BEGIN ERROR REPORT 50a93a08 --------
Full report at:
C:\Users\Barnes Electric\AppData\Roaming\.minecraft\crash-reports\crash-2012-12-23_20.28.13-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 12/23/12 8:28 PM

-- Head --
Stacktrace:
at ahv.h(SourceFile:49)
at ahv.<init>(SourceFile:35)
at ahr.<init>(SourceFile:16)
at ahs.a(SourceFile:78)
at net.minecraft.client.Minecraft.a(SourceFile:1370)
at auo.e(SourceFile:157)
at auo.a(SourceFile:122)
at aul.a(SourceFile:72)
at aul.d(SourceFile:127)
at aul.m(SourceFile:111)

-- Affected screen --
Details:
Screen name: bey
Stacktrace:
at net.minecraft.client.Minecraft.l(SourceFile:1086)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.4.6
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.6.0_37, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
Memory: 484135944 bytes (461 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2182, Intel
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

java.lang.RuntimeException: Failed to check session lock, aborting
at ahv.h(SourceFile:49)
at ahv.<init>(SourceFile:35)
at ahr.<init>(SourceFile:16)
at ahs.a(SourceFile:78)
at net.minecraft.client.Minecraft.a(SourceFile:1370)
at auo.e(SourceFile:157)
at auo.a(SourceFile:122)
at aul.a(SourceFile:72)
at aul.d(SourceFile:127)
at aul.m(SourceFile:111)
at net.minecraft.client.Minecraft.l(SourceFile:1086)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 5f0b7c5b ----------

saves folder not found. only thing in .minecraft is bin folder and stats folder. bin contains natives folder which contains some .dll files

Quote from Mikko_blu

Do you have Antivirus?
Try updating minecraft.

Minecraft Version: 1.4.6
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.6.0_37, Sun Microsystems Inc.

malware bytes
update mc to what?
created new world. saved. went back to that world ok.